PaseInt PHP equivalent to the Javascript

parse_int.php

<?php
	/**
	 * Just a parse int function, like the parseInt(string) from Javascript
	 */

	// If your PHP version is < 5.2, this is the solution:
	function parse_int($string) {
		$size_of_string = strlen($string);
		for ($i = 0; $i < $size_of_string; $i++) {
			if (is_numeric($string[$i]))
				$numbers[$i] = $string[$i];
		}
		return join("", $numbers);
	}
	
	echo parse_int("a1b2c3ção");

	// But if your PHP version is > 5.2 filter_var is enabled by default
	// So, validations, parsers and more are available if you using filter_var
	echo filter_var("a1b2c3ção",FILTER_SANITIZE_NUMBER_INT)
?>